Well, I think it's telling that the union doesn't want to get involved. If Martin had a serious claim, and formally brought it to Philbin, then he has good cause to break his contract. But if sounds like he didn't do that, to me.
This league isn't for everybody. I remember a walk-on a few years ago in Dolphins camp, and he just left. Couldn't take the work and just went home, without being cut first. And like any job, you're entitled to do that. But what happens when you sign a contract? Then it's not so easy. It sounds like Martin struggled to learn RT, when he really didn't want to be there, he went through his rookie hazing, second year things are not much better and coaches are screaming at you for allowing all those Tannehill sacks. You've lost 4 games in a row. Your teamates are riding your behind. Then you get moved back to RT where you hate it. You simply don't want to be here. Martin decided to walk away from it. So we'll see what happens.
A lot of posters here seem to think this is going to blow up, I don't think it will, I think it will die down, and they'll resolve it one way or another out of the media.